<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    button {
        margin-top: 10px;
    }
</style>
<script src="../js/vue.js"></script>
<body>
    <div id="root">
        <h1>学生信息</h1>
        <button @click="student.age++">年龄+1岁</button> <br/>
        <button @click="addSex">添加性别属性，默认值：男</button> <br/>
        <button @click="student.sex = '未知' ">修改性别</button> <br/>
        <button @click="addFriend">在列表首位添加一个朋友</button> <br/>
        <button @click="updateFirstFriendName">修改第一个朋友的名字为：张三</button> <br/>
        <button @click="addHobby">添加一个爱好</button> <br/>
        <button @click="updateHobby">修改第一个爱好为：开车</button> <br/>
        <button @click="removeSmoke">过滤掉爱好中的抽烟</button> <br/>
        <h3>姓名：{{student.name}}</h3>
        <h3>年龄：{{student.age}}</h3>
        <h3 v-if="student.sex">性别：{{student.sex}}</h3>
        <h3>爱好：</h3>
        <ul>
            <li v-for="(h,index) in student.hobby" :key="index">
                {{h}}
            </li>
        </ul>
        <h3>朋友们：</h3>
        <ul>
            <li v-for="(f,index) in student.friends" :key="index">
                {{f.name}}--{{f.age}}
            </li>
        </ul>
    </div>

</body>
<script>
   const vm = new Vue({
        el:'#root',
        data:{
            student:{
                name:'tom',
                age:'18',
                hobby:['抽烟','喝酒','烫头'],
                friends:[
                    {name:'jerry',age:35},
                    {name:'tony',age:36}
                ]
            }
        },
        methods: {
            addSex(){
                //vue.set(this.student,'sex','男')
                this.$set(this.student,'sex','男')
            },
            addFriend(){
                this.student.friends.unshift({name:'jack',age:70})
            },
            updateFirstFriendName(){
                this.student.friends[0].name = '张三'
            },
            addHobby(){
                this.student.hobby.push('学习')
            },
            updateHobby(){
                //this.student.hobby.splice(0,1,'开车')
                //vue.set(this.student.hobby,0,'开车')
                this.$set(this.student.hobby,0,'开车')
            },
            removeSmoke(){
                this.student.hobby = this.student.hobby.filter((h)=>{
                    return h !== '抽烟'
                })
            }
        },
    })
</script>
</html>